Transformer.



W. M. DANN; TRANSFORMER.

A'PPLICATION HLEDSEPL IO. I915.

Patented Sept 24, 1918.1

ZSNEETS-SHEEI I;

Fig. 2.

INVENTOR Wa/fer M. Dunn ATTORNEY w. M. DANN.

TRANSFORMER.

APPLICATION FILED SEPT. I0. 1915.

Ptented Sept. 24,191&

- INVENTOR Wa/ferMDan/r A'ITYIORNEY WALTEB M. mum, or winxmsnune, PENNSYLVANIA, ASSIGNOR 'ro wnsrmo nousn ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

TRANSFORMER.

Specification of Letters Patent. Patented Sept. 24, 1918.

Application filed September 10, 1915. Serial No. 50,101.

To all whom it may concern:

Be it known that I, WALTER M. DANN, a citizen of the United States, and a resident ofWilkinsbur in the, county of Allegheny and State of ennsylvania, have invented a new and useful Improvement in Transformers, of which the following is a specification.

My invention relates to electrical translating devices, and it has special reference to air-cooled transformers.

More particularly, my invention refers to air-blast transformers of the shell type of construction that are cooled by means of forced drafts traversing ventilating ducts which may be disposed between the coils, between the core-members and between the core-members and the coils.

.Heretofore, the core members and coils comprising an air-blast transformer have usually been positioned in a casing which inclosed the transformer. Forced drafts of air were-circulated in the casing in order to ventilatethe transformer structure and, in thisrinstance', air currents were directed between the inner wallsof the casing and the adjacent sides of the core-members. This method of construction was expensive and also produced atransformer that was cumbersome to handle.

Since transformers of the shell type of construction usually require two similar core members that are spaced a short distance from each other, it is necessary to provide aflventilatin means which is adequate to properly coo the core members. Shell-type transformers embodying'the aforementioned method of construction are now commonly used, the inclosin casing, however, being dispensedwith. a. su stitute for an in closing? casing, a casing is provided at the lowerportion of the core members and at the upper ortionthereof only, inorder. to inclose t e projecting coil-ends,the terminal boards, etc, The ower end casing constitutes anair chamber into. which forced air drafts forventilating the transformer are admitted, and these an currents,traversing the ventilating ducts between the core mom.- bers and'the coils, are the only cooling means employed. .The'eoreamembers, asa result, are inadequatelyventilated because the air currents are. not; properly directed across their adjacent sideebutflpass into the outer wir at points in close proximltyto .thelower end frame whence they originate. Since the upper portions of the transformer core members tend to become. hottest, it is desirable for economical operation toadequately cool the upper portions of the core members.

An object of my invention is te -provide means, in a shell-type transformer, for ventilating the core-members by properly dirooting coolin air currents thereupon during the operation of the transformer. Other features of novelty in my present invention are set forth in detail in the following description and pointed out with particularity in the appended claims.

Referring to the drawings, Figure 1V is a view, partially in. elevationand partially in section, of an air-blast, shell-type. transformer embodyinga form ofmy invention; Fig. 2 is a plan view of the transformer shown in Fig. 1. with a portion of the'upper casing removed in order to show the interior construction-of the transformer; Fig.

3 is a crosssectional view of a portion of the transformer taken between the spaced core members, Fig. 4 is a view taken at right Iangles to the view shown in Fig. 3. and emying a portion of both core members of the transformer, and Fig. 5 is .a -perspective view partially in section, of a portion of the transformer shown in Fig. 1.

In Fig, 1 and Fig. 5, a core structure 1 of the shell-type construction embraces -a lurality of coils 2 and awplurality' of .coi s 3 of the transformer, said coils being. s aced from one another in order -to permit-t e, insertion of insulating barriers. 4 andto pro? vide a series of air or.ventilating-ducts 5 which afiord communication between an air chamber 6, provided in a lower end frame 7 and an upper air chamber 8, provided in an upper and frame 9. The transformer is supported upon the end frame 7 havin an opening 10 the ventilatlng air draftsare admitted into the air chamber 6. 'Die-bolts-lliextending through the core structur'enfi'rmly holdthe laminations comprising the corestructure to one another. 1. The upper casing-9' engages the upper surfaces 12: of inverted'fU- sha ed members 13, the latter being secured to t e tie-bolts 11, substantially. as shown in the drawing.- Eye bolts 14:, en a 'ngthe upper face of the casing 9, secure y old-the casing upon the upper .portionof the transformer core structure. Outlet bushings 15 provided therein through w ich 

